As his fame grew, he put his wealth into inventions,
continuing to experiment with the properties of alternating
current and electricity in general. Exploring into high
frequency electricity, he attempted to use rotary alternating
current generators but found at desired speeds, the machines
would fall apart. So in 1891, Tesla invented the "Tesla
Coil," a high frequency alternating-current transformer. The
components of the device were stationary and thus allowed the
amplification of the current and generation of a greater amount
of voltage without falling apart.
His scientific discovers and observations on the nature of
electricity were often written in his personal paperwork and
magazines such as "Electrical Experimenter." Attributing
around 300 patents to his name during his lifetime, he made
discoveries such as the rotating magnetic field and helped to
make advancements in the fields of wireless communication,
x-ray, and energy.
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